Diels–Alder Reactions of 2′-Hydroxychalcones withortho-Benzoquino-dimethane: A New Synthesis of 3-Aryl-2-naphthyl 2-Hydroxyphenyl Ketones
作者:Cristela M. Brito、Diana C. G. A. Pinto、Artur M. S. Silva、Ana M. G. Silva、Augusto C. Tomé、José A. S. Cavaleiro
DOI:10.1002/ejoc.200500872
日期:2006.6
Diels–Alder reactions of the 2′-hydroxychalcones 1a–e with ortho-benzoquinodimethane (3) yielded the 3-aryl-1,2,3,4-tetrahydro-2-naphthyl 2-hydroxyphenyl ketones 4a–e in good yields. The dehydrogenation of the cycloadducts 4a–e to 3-aryl-2-naphthyl 2-hydroxyphenyl ketones 5a–e was studied. Good results were obtained when DDQ was used as oxidant and microwave irradiation as energy source. Several benzoxanthone
2'-羟基查尔酮 1a-e 与邻苯并醌二甲烷 (3) 的 Diels-Alder 反应以良好的产率生成了 3-芳基-1,2,3,4-四氢-2-萘基 2-羟基苯基酮 4a-e。研究了环加合物 4a-e 到 3-芳基-2-萘基 2-羟基苯基酮 5a-e 的脱氢反应。以DDQ为氧化剂,以微波辐射为能源,取得了良好的效果。还获得了作为次要产物的几种苯并氧杂蒽酮衍生物。所有新化合物的结构都是通过广泛的 NMR 研究确定的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)